Anaerobic fermentation produces gases containing methane, which are combustible (biogas). Depending on the raw material used for operation (feeding) of the plant, these gases contain impurities, such as hydrogen sulfide – a very harmful gas that when combined with water forms sulfurous acid. There are various methods available to minimize the hydrogen sulfide content in the process (desulfurization). Some are based on feeding of gas, such as air (oxygen) or liquids (e.g., iron(III) solution), while others are based on cleaning of the gas by a filter.

UNION Instruments offers an optimally equipped version of its modular INCA gas analyzer as a solution for this. This determines the content of hydrogen sulfide and oxygen, and the measured values serve as a control variable for the addition of gas or liquids. INCA uses a special measuring technique to measure over broad spectral ranges at very high accuracy. Further on , INCA uses a patented micro pulse method, which allows a measuring range of 0 to 10,000 ppm of H2S and consequently even the "0" can still be resolved The sample gas preparation is integrated in the device and cools and dries the gas. The optional sample gas changeover is expandable up to 10 measuring points and is able to draw in sample gas from up to several hundred meters away.

The measured values provide plant operators with information about the process, enabling them to optimize plant operation in terms of both technical, safety and cost aspects (when to replace the activated carbon, low oxygen concentration) and to meet the increased requirements.

Anaerobic fermentation produces gases containing methane, which are combustible (landfill gases). These are brought together from multiple extraction points. This gas is used as an energy source and frequently to power gas engines. Before its feed to the engine, the gas must be monitored for a minimum methane content and natural gas or liquefied petroleum gas is added as necessary.

UNION Instruments offers an optimally equipped version of its modular INCA gas analyzer as a solution for this. It determines the content of methane, carbon dioxide, hydrogen sulfide, and oxygen. The measured values serve as a control variable for the blending control. INCA uses a special measuring technique to measure over broad spectral ranges at very high accuracy. The sample gas preparation is integrated in the device and cools and dehumidifies the gas. The optional sample gas changeover expandable up to 10 measuring points is able to draw in sample gas from up to several hundred meters away.

The composition of the combustion gas influences start characteristics, efficiency, and knock resistance of gas-powered engines. The use of INCA assures optimal operating conditions for the engine and prevents problems that can lead to destruction of the engine and significant subsequent financial consequences, in particular. In addition, the quantity and composition of the gases from the extraction points allows conclusions to be drawn about the quality of the fermentation process.